Question

在java中，如何只读取文件中的数据，并忽略前面的字符串？伙计们，我做了很多研究，但我似乎无法找到它。

这是一个示例文本文件：

number of courses:3
course numbers:219 214 114
arrival Probabilities:0.4 0.6 0.8
min time:2
max time: 4
num cups:1
simulation time:50
number of tas:2

现在你们可以看到，我只想阅读数字。

我当前的代码如下，但由于显而易见的原因我遇到了InputMismatchException（它首先读取字符串而不是整数）：

//Read file
        while(input.hasNext()){
            //Read Number of Courses

            numCourses = input.nextInt();
            courseNumbers = new int[numCourses]; //Initialize the size of courseNumbers array.
            arrivalProbability = new double[numCourses]; //Initialize the size arrivalProbability array.

            //Read the CourseNumbers, numCourses times.
            for(int i = 0; i < numCourses; i++){
                courseNumbers[i] = input.nextInt();

            }

            //Read the arrivalProbability, numCourses times.
            for(int i = 0; i < numCourses; i++){
                arrivalProbability[i] = input.nextDouble();

            }

            //Read minTime
            minTime = input.nextInt();

            //Read maxTime
            maxTime = input.nextInt();

            //Read number of Coffee cups
            numCups = input.nextInt();

            //Read simulation time
            officeHrTime = input.nextInt();

            //Read the number of TAs
            numTAs = input.nextInt();
        }

提前感谢您的帮助！

Answer 1

我会这样做：

读一行
解析该行，确定哪个部分是标签，哪个部分是数据
使用标签确定如何存储数据

请勿使用nextInt，请使用nextLine。您需要进行比我在此处包含的错误检查更多的错误检查，但我会这样做：

int numCourses;
int[] courseNumbers; // I would use a list here, but sticking with your data types for clarity.

while(input.hasNextLine()) {
    String line = input.nextLine();
    String[] lineParts = line.split(":");
    String label = lineParts[0];
    String value = lineParts[1];

    if(label.equals("number of courses")) {
        numCourses = Integer.parseInt(value);
    } else if(label.equals("course numbers")) {
        String[] courseNumberStr = value.split(" ");
        courseNumbers = new int[numCourses]; // you probably want to make sure numCourses was set and courseNumStr has the correct number of elements
        for(int i = 0; i < courseNumberStr.length; i++) {
            courseNumbers[i] = Integer.parseInt(courseNumberStr[i]);
        }
    } else if( /* handle the rest of the inputs */) {
        // etc
    }

如何只读取文件中的数据（忽略字符串）？

1 个答案: